Punching apparatus



April 7,1953 c. ROZANEK 2,633,890

' v PUNCHING APPARATUS Filed Nov. 5, 1949 '3 Sheets-Sheet l A INVENmR C. ROZANEK ATTORNEY p 1953 I c. ROZANEK 2,633,890

I PUNCHING APPARATUS Filed Nov. 5, 1949 s Sheets-Sheet 2 g 72 a a 14 L E h I E 62 fin I." it? I INVENTOR Fla; 3 v c. ROZANEK ATRDRNEV Patented Apr. 7, 1 953 TSITATES PATENT OFFICE PUNCHING APPARATUS Charles Rozanek, Baltimore, Md., assignor to Western Electric Company, IncorporatecLNew York, N. Y., a corporation of New York Application November 3, 1949, Serial No. 125,21o

This invention relates to punching apparatus, and more particularly toapparatus for slotting and crimping cup-shaped articles.

In .the manufacture of small cup-like articles which are slotted and crimped to form electrical contactslon the, interior thereof, the blank of suchan article is sometimes slotted to form a tongue, and the tongue then is crimped in a separate operation.

Furthermore, the slotting operations have been performed from the outside which leaves burrs on the inside. Such burrs were highly undesirable. on an electrical contact and had to be removed, which was a difiicult task because of the location of the burrs inside of the small article,

An object of the, invention is to provide. new and improved punching apparatus.

Another object, of the invention is to provide new and improved apparatus for punching and forming articles.

A further object of theinvention is to provide. new and improved apparatus for slotting and crimping cup-shaped articles.

An. additional object of the invention is to provide apparatus for slotting. a cup-shaped ,blank from the inside to the outside to form slots without burrs on the inside of the article,

and then crimping the resulting tongue.

An apparatus illustrating certain features of the invention may include apunching element, 'means for holding a cup-shaped blank in a position-over the end of the punching element, a

..die having an'opening therein for receiving the punching element, and means for causing relative movement between the die and the punch- .ing element. V

A complete understanding of the invention may be obtained from the following detailed description of an apparatus forming a specific embodiment thereof, when read in conjunction with the appended drawings, in which:

Fig. 1 is a fragmentary, front elevation of an apparatus forming one embodiment of the invention;

Fig. 2 is an enlarged, fragmentary, front elevation of a portion of the apparatus shown in Fig. 4 isan enlarged, fragmentary, vertical 2 Claims. (01. 153-2) a section of a portion of the apparatus shownin Fig. 1';

5 is, an enlarged, fragmentary, vertical section taken along line 5-5 of Fig. 4;

Fig. Bis an enlarged, fragmentary, vertical section taken along line 6-6 of Fig. 5;

1 Fig.7 is an enlarged, fragmentary, vertical section similar to Fig. 6, and f ,Fig. 8 is an enlarged, perspective view of an article produced by the apparatus embodying the invention."

Referring now in detail to the drawings, there is shown in Fig. 1 a movable ram [0 reciprocable along aguideway 12 toward and away from a dieholder I4 for slotting and crimping a cap IS. The ram I0 is connected to a shank l8 of a toolhold'er 20 secured by a set screw 24 in a bore 22 formed in the ram ill at a position in whicha shoulder 26 abuts the ram l0. Shearing blades 36 36 secured to a holding plate 32 by shank portions 3333 are provided with sloping :cutting ends 34-34 and advance guide portions '35- 35. A horn 36 designed to fit into the cap [6 is provided with a shank portion 38 having a crimping indentation 40 therein. The shankportion 38 of the horn 36 is riveted to a rod 4| mounted slidably in a bore 42-formed in the tool-holder 2B'and a bore 44 formed in the holding plate 32. A compression spring 46 mounted in a counterbore 48 formed in the tool-holder urges the rod 4| downwardly, as viewed in Fig. 3, toward a position in which a cap screw 50 secured to the rod 4| abuts the end of the counterbore 48. The horn 36 may be moved upwardly, as viewed in Fig. 3, with respect to the blades 30-30 until the horn strikes a stop '52 carried by the holding plate 32, which distance is sufficient to permit the cutting ends 34-34 of the blades to completelycut through the cap [6 at the edges of the cutting ends. 7

On downward movement of the ram I6 toward. the die-holder Hi, the cap I6 is moved into engagement with a camming spring 56 which presses the cap l6 against the end of the horn 36 to precisely locate the cap on the horn. A die 68 is held by a set screw 62 in a counterbore'60 formed in the die-holder Id. The die 58 is provided with slots 63-63 having shearing edges 64-64 designed to cooperate with jthe cutting ends 34-34 to shear the cap l6 to cut segments, of which a segment 66 (Fig. 7) is shown, to form slots 68-63 in the cap l6 leaving a tongue 10 between the slots. The slots 63--63 also guide the advance guide portions 35-35 of the blades 30-30 during the'shearing operation so that the bladesare firmly supported as theywsheara A crimping bead 12 formed on the die 58- is designed to press the end portion of the tongue 16 into the crimping indentation 40 formed in the shank portion 38.0f the horn 36 to form a crimp 14 in'the tongue 10. A die-holdingplate 16 is provided with a cutaway portion'l8 to provide clearance for threads formed on: the cap I6. The die 58 and the die-holding plate 16 have a groove 82 formed therein complementary to the curvature of the cap I6.

Tubes 86-86 are connected to a chamber 88 supplied with compressed air after the ram III- top surface 90 of the chamber 88 serves as a gauge for assembling the tool-holder 20 to the ram I0; Liner pins 92-92 secured to the dieholder I4 guide the tool-holder 20, and keep the tools secured to these elements aligned at all times.

Operation With the ram II) in its upper position,the cap I6 is placed upon the horn 36. Reciprocating means then is actuated to move the ram through one reciprocation. The ram I0 moves the ele-' ments carried thereby downwardly, as viewedin Fig. 3. As the cap I6 is moved into contact with the bead 72 of the die 56, the spring 56 presses the cap I6 against the horn 36. Upon further downward movement of the ram I0, the blades 30-30 move downwardly therewith to shear initially the portions of the cap at the bead I2. The spring-pressed horn then moves the cap fully into the groove 82, and the blades 30-30 (Fig. 7) complete the cutting of the slots 68-68 (Fig. 8) The rod 4I slides in the bores 42 and 44 (Fig. 3) to permit the horn 36 to remain stationary until th blades 30-30 have cut the portions of the cap on each side of the bead I2. The sloping cutting ends 34-34 of the blades shear the cap incrementally so that no undue strain is placed on the blades.

After the slots have been completely out, the stop 52 engages the horn 36 and moves it and the cap I6 hard against the die 58 and the dieholding plate 76 so that the crimping bead I2 formed on the die 58 and the crimping indentation 40 formed in the shank portion 36 of the horn 36 form the crimp I4 on the tongue I0. The lost motion connection between the blades 30-30 and the horn 36 provides sequential shearing and crimping so that these operations do not interfere with one another, and very close tolerances may be provided in the dimensions of the slots 60-66 and the crimp 14.

The ram I 0 then is raised, and jets of air from the tubes 86-86 (Fig. 2) blow the cap I6 from the horn 36 after the cap is raised above the camming spring 56 to the starting position thereof. At the start of the raising movement of the ram I0, the spring 46 (Fig. 3) presses therod 4I downwardly to hold the cap I6 against the die 56 until the blades 30-30 have been moved back to positions completely inside the cap I 6 and the cap screw 50 engages the end of the counterbore 48 in the tool-holder 20. The blades 30-30, the horn 36 and the cap I6 then are raised as a unit and the cap I6 is moved out of contact with the camming spring 56. The operation described .hereinabove then may be repeated to slot and jcrimp another cap (not shown) identical with the cap I6.

The above-described apparatus serves to sequentially slot and crimp caps so that close dimensions may be maintained in the caps, and also serves to slot small caps with a shearing operation proceeding from the inside of the caps "to the outside thereof so that any burrs formed by the shearing operation are formed on the outside of the caps. Consequently, access is provided for removal of the burrs without difficulty,

if such removal is necessary, and no objection- -cup-shaped article, which comprises a generally cylindrical horn having a pair of guideways formed therein transversely of the longitudinal 4 axis thereof and also provided with a crimping recess extending from one guideway to the other guideway, a pair of blades having shank portions and cutting portions extending generally transversely from the shank portions at points in- ;termediate the ends thereof, said blades being slidable in the guideways, a ram supporting the blades, means connecting the horn to the ram for urging the horn to a position in which the cutting portions of the blades are wholly within the guideways in the horn so that a cup-shaped artimoved toward the die.

cle may be positioned over the end of the horn and the cutting portions of the blades, a stop for limiting movement of the horn against the action of the horn-urging means, and a die having a pair of slots for receiving the blades and provided with a crimping bead extending between the slots, said ram being movable toward the die tosequentially move a cap positioned over the horn and the cutting portions of. the blades into engagement with the die, force the blades through the cap to'form slots in the cap and move the born by the stop to crimp the portion of the cap between the slots thereof.

ing cutting edges, said blades being slidable in the guideways, a ram supporting the blades rigidly, means connecting the horn to the ram for urging the hornto a position in which the cutting portions of the blades are wholly within the guidewaysin the horn so that a cup-shaped article may be positioned over the end of the horn and the cutting portions of the blades, a stop for limiting movement of the horn against the action of the horn-urging means, a die having a pair of slots for receiving the blades and provided with a crimping bead extending between the s1ots,'.said ram being movable toward the die to sequentially move a cap positioned over the Y horn and the cutting portions of the blades into engagement with the die, force the blades through the cap to form slots in the cap and move the horn by thestop to crimp the portion of the cap between the slots thereof, and a-spring for pressing the cap on the horn as the cap is CHARLES ROZANEK.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

